Above N644AA2 Flght 77, the aircraft "they" say struck the building, Right, From Pentacon.com a computer animation of the flyover compiled from the testimony of numerous eye witnesses.

Pentacon.com

Quote:

This is the latest mystery plane, it is thought to be the same aircraft seen climbing over the Pentagon during its approach, the previous mystery plane pictured over the White House at 9:44 am on 11 September 2001, was a highly modified E-4B Boeing 747 operated by the National Airborne Operations Center.